LibJS: Add Date methods: setHours, setMinutes, setSeconds, setMilliseconds

Author: https://github.com/tuqqu
Commit: 43f0c92bcd
Pull-request: https://github.com/SerenityOS/serenity/pull/5873
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setHours.js

@@ -0,0 +1,21 @@
+test("basic functionality", () => {
+    let d = new Date(2000, 2, 1);
+
+    d.setHours(2);
+    expect(d.getHours()).toBe(2);
+
+    d.setHours(2, 30);
+    expect(d.getHours()).toBe(2);
+    expect(d.getMinutes()).toBe(30);
+
+    d.setHours(2, 30, 50);
+    expect(d.getHours()).toBe(2);
+    expect(d.getMinutes()).toBe(30);
+    expect(d.getSeconds()).toBe(50);
+
+    d.setHours(2, 30, 50, 600);
+    expect(d.getHours()).toBe(2);
+    expect(d.getMinutes()).toBe(30);
+    expect(d.getSeconds()).toBe(50);
+    expect(d.getMilliseconds()).toBe(600);
+});

Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setMilliseconds.js

@@ -0,0 +1,6 @@
+test("basic functionality", () => {
+    let d = new Date(2000, 2, 1);
+
+    d.setMilliseconds(600);
+    expect(d.getMilliseconds()).toBe(600);
+});

Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setMinutes.js

@@ -0,0 +1,15 @@
+test("basic functionality", () => {
+    let d = new Date(2000, 2, 1);
+
+    d.setMinutes(30);
+    expect(d.getMinutes()).toBe(30);
+
+    d.setMinutes(30, 50);
+    expect(d.getMinutes()).toBe(30);
+    expect(d.getSeconds()).toBe(50);
+
+    d.setMinutes(30, 50, 600);
+    expect(d.getMinutes()).toBe(30);
+    expect(d.getSeconds()).toBe(50);
+    expect(d.getMilliseconds()).toBe(600);
+});

Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setSeconds.js

@@ -0,0 +1,10 @@
+test("basic functionality", () => {
+    let d = new Date(2000, 2, 1);
+
+    d.setSeconds(50);
+    expect(d.getSeconds()).toBe(50);
+
+    d.setSeconds(50, 600);
+    expect(d.getSeconds()).toBe(50);
+    expect(d.getMilliseconds()).toBe(600);
+});